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Power & Energy

How the Electric Grid Works

The US has three largely separate grids, managed by Regional Transmission Organizations coordinating reliability across states. Learn why interconnection queues create 5-8 year delays.

5 min read

Key Takeaways

  • 1 The US has three separate grids—Eastern, Western, and Texas (ERCOT)
  • 2 RTOs manage wholesale markets and coordinate reliability across states
  • 3 Interconnection queues create 5-8 year delays—the binding constraint
  • 4 Behind-the-meter bypasses the queue but costs 2-3x more

Three Nations of Electricity

The US doesn't have one grid—it has three largely separate networks with minimal connections between them.

Eastern
~2/3
of US population
Atlantic to Great Plains
Western
11
western states
Rockies to Pacific
Texas (ERCOT)
90%
of Texas load
Isolated by design
Why Isolation Matters
52 GW
Texas capacity lost in Winter Storm Uri
~0 MW
help from other grids
200+
deaths

The Three Layers

Power flows through three distinct stages from plant to plug—each at different voltages.

Generation
10-25 kV
Power plants
Transmission
115-765 kV
Long distance
Distribution
120-240 V
Local delivery
2 MW 200-home neighborhood
vs
1,000 MW gigawatt data center

Distribution can't handle AI-scale loads—data centers must connect to transmission.

RTOs: The Traffic Controllers

Regional Transmission Organizations coordinate grid operations across utility territories—like air traffic control for electrons.

PJM
13 states + DC
65M people served
$50B annual market
MISO
15 states
42M people served
ERCOT
1 state (isolated)
26M people served

The Queue Bottleneck

Connecting large loads requires years of studies. The queue backlog has reached crisis levels.

PJM Interconnection Queue
270+ GW
requested
185 GW
total installed capacity
5-8 yrs
wait time
PJM (Federal)

5-8 Years

Multi-state coordination, FERC oversight

ERCOT (Texas)

2-4 Years

Single state, faster approvals, more risk

Behind-the-Meter: The Workaround

On-site generation bypasses the queue—but at a cost.

Advantages
  • No queue waiting
  • Direct control
  • Grid backup
Disadvantages
  • 2-3x cost vs grid
  • Direct emissions
  • Fuel logistics
The Bottom Line
Behind-the-meter is a workaround, not a solution The fact that operators seriously consider it shows how severe the grid bottleneck has become

Why This Matters for Data Centers

Site selection must start with transmission topology. You can negotiate everything else in months—grid connection takes years.

Go Deeper

Chapter 5 of This Is Server Country examines why the interconnection queue backlog grew from manageable to crisis-level, how utilities allocate upgrade costs, and why technical fixes alone cannot solve what is fundamentally a governance problem.

Learn more about the book →